jackson



(No Model.) 6 Sheets-Sheet 1.

G. A. JACKSON. TELEPHONE SYSTEM.

No. 335,588. Patentedleb. 9, 1886.

6 Sheets-Sheet 2.

Patented Peb. 9, 1886.

C. A. JACKSON. TELEPHONE SYSTEM.

(No Model.)

an Zine LZ".

Ey. 4L.

(No Model.) 6 Sheets-Sheet 3. C.. A. JACKSON. TELEPHONE SYSTEM.

(No Model.) 6 Sheets-Sheet 4.

C. A. JACKSON, TELEPHONE SYSTEM.

(No Model.) 6 Sheets-Sheet 6.

C. A. JACKSON. TELEPHONE SYSTEM.

Patented Feb. 9, 1886.

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N. PETERS, PnolvLimogmphr, wnxmngmn, n. c,

UNITED STATES PATENT OFFICE.

CHARLES ALMON JACKSON, OF LAVRENCE, MASSACHUSETTS, ASSIGNOR TO DAVID F. ROBINSON, OF SAME PLACE.

TELEPHONE SYSTEM.

SPECIFICATION forming part of Letters Patent No. 335,588, dated February 9, 1886.

Application filed August 11, 1855. Serial No. l7l,i33. (No model.)

To all whom it may concern: alarm apparatus is in the same relative posi- Be it known that I, CHARLES ALiroN JACK- tion in said subscribers otiice and that the SON, a citizen ot' the United States, residing at latter can be rung up. Lawrence, in the county of Essex and State of A prominent feature in my invention and 5 Massachusetts, have invented certain new and the system embodied therein is contained in useful Improvements in Telephone Systems; the apparatus termed the call-indicator77 and I do hereby declare the following to be a and the individualalarm call,7 by which a full, clear, and exact description of the invensynchronous and equal movement f every tion, such as will enable others skilled in the hand on each individual-alarm call apparatus ro art to which it appertains to make and use the of every subscriber on a given circuit, except 6o same, reference being had to the accompanying the subscriber calling, is effected by the movedrawings, and to letters or figures of reference ment of the call-indicator hand ot' said submarked thereon, which form a part of this scriber. Thus every subscriber may switch specification. in at option any subscriber on his own circuit,

i This invention relates to telephone systems; as well as those upon other circuits; and my 65 and it consists in the peculiar arrangement of invention further embraces apparatus by the calling apparatus and the connectingwhich said indicator-hand and the individualwires, by which the use of a central otlice, alarm-call hands may be restored to their norso termed, is avoided. Each system may conmal position (to zero) by any subscriber who zo tain any number of subscribers, and each subhas `inst made a call and has iinished his con- 70 scriber on his own circuit has four wires, while versation, or by a subscriber preparatory to by means of amovable switch-board he can making a call to ring up any one. The syscommunicate with any other subscriber on tem, moreover, embraces a movable switchother and different systems running through board, whereby various lines of subscribers his office orbuilding. Each subscriber is promay readily communicate with each other as 75 vided with an individual-call wire, with which they choose or as business requires. is connectedadial and an indicator-hand mov- Further details ot' mechanism and the vaing thereon, this hand being operated at will rions circuits and directions of the electric by a call-tapper and an electro-magnet concurrents employed will be more fully herein- 3o nected with the call-wire circuit. Furtherafter described. SO more, each subscriber is provided with a sec- The drawings accompanying this specificaond apparatus, termed the individual-alarm tion represent, in Figure l, a plan of the indi` call,77 since by means of this instrument any vidual-call apparatus and movable switchsnbscriberis notified that communication with board provided for each subscriber, and Fig.

him is desired by nome one else. Now, this 2 is a sectional elevation of the call apparatus 85 calltapperoperates the indicator-dial through embodying my improvements. Fig. 3 is a the same circuit which communicates with horizontal section, enlarged, on linexw of Fig. every other subscribers individual-alarm ap- 2,ot` the mechanism foractuating theindicatorparatus upon each complete system 5 and, alarm and call-hands, andshownin'an inactive 4o moreover, since the movement of the callposition, while Fig. 4 is a similar section of 9o tapper operates theindicator-hand on the face the same parts in active operation. Fig. 5 is ot' the call-dial and synchronously therewith a plan of the movable switch-board, and Fig. the hands on the individual-alarm apparatus 6 is a cross-section of the same. Fig. 7 is a ot' all other subscribers upon that system, it plan of the individual-alarm-call apparatus,

is apparent that any subscriber may operate and Fig. 8 a longitudinal vertical section of 95 his call-tapper and watch the indicator-hand the same. Fig. 9 is a front View of a portion on the call-dial until it has reached the proper of the individual-alarm-call dial and hand and number belonging to the subscriber with also of the rotary switch-hand. Fig. l0 is a whom he desires to communicate, when he front elevation ofa part of the individual-call 5o knows that the hand upon that individuals dial and hand. Figs. 1l and l2 are front eleroc vations of the bell-switch lever shown in two positions simultaneously in different offices, and Fig. 13 is a plan of the same. Figs. 14

and 15 represent as a whole a diagrammatic l 2, and portions in 3 and 4, which embodies a very important feature in my system. Each subscriber is provided'with one of such instruments, and by means of and through which the attention of any other particular or individual subscriber is obtained without the aid of a central office. Furthermore, I start with the premise that the two keys marked L M and secured upon the movable switch-board serve to operate the individual-call hand b, and synchronouslytherewith every individuals alarmcall hand V in every subscribers office upon that system except his own. This apparatus is composed of a base-plate, B, provided with suitable upright standards, a a a. This plate may be secured in any convenient part of the room or office, While upon the standards is mounted .a shaft, C, which extends through two circular metal disks, D E, and has a pointer or indicator hand, Z, secured at one end. The front plate is secured to one of the standards a, and is divided into aseries of equal divisions, numbered according to the subscribers on that system or the subscribers upon other systems connected therewith. The second plate or disk, E, is a spur-wheel attached to the shaft C, and rotates the latter by means of the teeth cutin its periphery and adapted to engage a reciprocating arm, c. (See Figs. 3`aud 4.) Now, since each subscriber in this system is provided with an indicator-dial, D, and hand b, which operates and shows the position of every subscribers indicator-alarm hand V upon its dial, it is Very necessary that the movement of every hand upon each apparat-us should be synchronous, and means must be provided to insure a positive movement of all, so that if one hand on a certain dial stands upon division five every other hand in each office upon that particular circuit should likewisebe in that position. To effect this, I maintain the toothed wheel E always locked, except when movement is required, and to operate saidy wheels positively Iproceed asv follows: Mounted in the standards a a a of the baseplate B are two rods or bars, c d, the active or operatin g ends of which are adapted to engage with the teeth of the disk E, the rod c being the actuating and the bar d the locking instrumentalities. As shown in Fig. 3, the bar c is provided with a pivoted arm, e, the nose f of which is adapted to enter the spaces between the teeth, while a spur, g, is adaptedto engage a similar spur, h, formed on the bar d.-

Advance movement of the rod c is effected Vby means of lever-arm t, actuated by the electromagnet F and return movement by means of a spring, 2. The rotary feed motion is effected by advance of the rod c pressing the pivoted arm e against an incline or block, j, which causes lateral thrust of the arm and movement of the disk E one tooth. The corresponding or locking arm, d, is provided at its active end with a slot, 7c, of the width or somewhat wider than the thickness of the disk E; hence with the advance movement of the rod c simultaneous motion of the rod d is secured by the spur `@engaging with it the spur h, and thus the slot k is brought to coincide with the disk and motion of the latter permitted by the conti nuous advance of the rod c, which thrusts its arm e laterally to advance the disk'E the space of one tooth. This lateralmotion has likewise disengaged the two spurs, and the rod d, by the action of its spring 3 at the rear, is permitted to retreat and change the position of the slot` 7c, thereby locking the disk E during the inactive or retreat movement of the rod c, and while the arm e is regaining its normal position in readiness to advance and engage a second tooth. The restoration ofthe arm e toits normal position in alignment with its rod c is effected by means of a flat spring, 4, or other equivalent, against whose tension the arm e is exerted during its lateral outward thrust. Suitable stops, ZZ, limit the rods d ein their retreat movenient. Thus it will be observed that closing of the circuit to render the magnet F active will IOO actuate the lever z' and advance the rod c and..

with it the rotary disk the space of one tooth. The active movement of the disk E is against the tension ofa spring, 5, or Weight; hence to release said disk in order to restore the dial-hand beto its normal position at zero, I employ a second electro-magnet, G, and a lever, m, with a pin, n, affixed in the rod d, and

when the magnet is actively induced by closing the circuit with the tapper L, the lever is actuated and pressed against the pin n on the rod d. The latter is then thrust forward, advancing the slot k into alignment with the teeth of the disk E and unlocking the latter, which is restored to its normal position by reverse rotary movement, and carries with it the dial-hand b, which is secured to the extremity of the shaft C. Thus it will be seen that byinterrupting the currenta certain number of times the disk E will be advanced a cer-l tain number of teeth by means of the electro- IIO magnet F, and the indicator-hand b will be instruments electrically, theywill all be forced to' move synchronously and through equal spaces in a given time, and thus the position of one hand b in any office will insure and positively indicate the position of every hand V on all the individual-alarm dials connected in that particular circuit.

The above shows the mechanism by which a subscriber can operate, by means of his indicator-call apparatus A, the individual-alarm instrument shown at A in Figs. and 8.

The general arrangement and operation of parts by which the movement of the alarmdial hand V is effected is the same as in the indicator-call apparatus A above describedthat is, by an interruption of the current and movement of the hand I). Thus asynchronous movement of the dial-hands V in other subscribers7 offices is effected by means of the shaft C', rotated by the toot-hed wheel E, reciprocating rods c d', and the electro-magnets F G and their levers t" oir-that is, the twoinstruments, the indicatorcall A and the individual alarm-call A', have the dial-hands b V operated in precisely the same manner and by similarinstrumentalities; butin the individualalarm call A this apparatus is further provided with a switch-plate, I, and rotary switcharm J. This plate is insulated from the shaft C', and also from the standard to which it is secured, (see Figs. 7 and 8,) and the shuntarm J is mounted upon the rotary shalt C and revolves with it, while the outer end is furnished with a fricton-roller, o, to maintain continuous metallic contact with the rim of said plate. The rim of the plate is provided with a metallic pin, p, which is insulated therefrom. Thus when the switch-arm J is in radial alignment and in contact with the pin p, the current passes through the shaft C', arm J, and pin p, and is shunted to the bell-wire 72, while when said arm J is in any other position the current is passing uninterruptedly through the plate I and pin q onward by wire 25, and the bell is cut out. Now, thisinsulated shunt-pin p is differently located foreach subscriber upon his particular switch-plate Land bears a certain relation to the indicator alarmhand V. Thus for subscriber number 2 on any given circuit,when the dial-hand V is upon 2 the switcharm J must be over the shunt-pin 5o p in order to conduct the current along a Wire connecting with the bell ot' said subscriber. Therefore the position of the indicator callhand b on the instrument A will give the position of the indicator alarm-hand V upon a certain number on every dial, and, moreover, will indicate that the bell of the subscriber having such number can be rung and the attention of the individual obtained; hence each switch-plate will be provided with al single shuntpin, p; but the relative position of that point will vary from that of any other upon all switch-plates connected on that circuit or with other circuits. The movable switch board is shown in 5 and 6 as consisting of a sliding plate, K, mounted upon two parallel guide-rods, w1, and provided with a pointer, s, and two keys, L M, which are adapted to maintain the current normally open. Metallic spring circuit-breakers ttt u a u are so disposed beneath the plate that three of the circuits on each system shall be opened, as shown in Fig. 6, and the currents shunted through the apparatus in the office. Vhen the plate K is moved along, the springplates return together and the circuitis closed and continues on in a direct course.

In the switch-board herein shown I have represented three separate systems, Nos. 4, 5, and 6, massed in order to be controlled by a single switch-board, K, and designate the wires as follows, supposing them to belong to No. 4 system:

The numeral 4 designates the telephonewire; No. 1*, the bellcall; No. 2*, the indicator call-line, and No. 34 the circuit by which the indicator call-hand is released and restored to Zero. In this nomenclature the exponents represent the systems to which the several wires belong.

Upon the front of the individual-alarm-call apparatus A is secured a bell-switch lever, N, pivoted at one end to the box inclosing the apparatus, and at the other furnished with a hook upon which is hung the receiver O when not in use. The object of this arrangement in connection with a series ot' circuit-closers disposed above and below it is this: When the re' ceiver is hung upon the pivoted bar Nin any subscribers office, his bell can be rung by others only when his indicator alarm-hand V is upon his especial callnumber, which places the switch-arm J over the shunt-pin p, leading to the bell U. On the other hand, when the receiver is oii':` and the lever is up, the bell may be immediately rung without any previous preparation,and this is especially desired when a given subscriber has made a call and is awaiting a reply through his own bell.

In Fig. 13 is shown a plan of the mechanism, in which the leverbar Nis provided with a piece of insulating mateiial, P, which insulates the plate S, secured upon the inside o1' said arm. Furthermore, the circuit-closers are arranged in two series or planes. One set, 2i' 28 eti 46, is in vert-ical alignment, and is operated by the plate S, while the other setis in alignment-with the bar N and operated by contact with the latter. Thus the rise and fall ofthe lever N operates to open and close two distinct circuits. (See Figs. li and 12.) The levers N N', Sac., are adjusted to move quite stiflly, in order to remain in any desired position, either up or down, in order to change the currents when desi red. The receivers O &c., are to be hung thereon when not in use, and intended to maintain the levers depressed, .which is their normal position.

The operation ot' ringing up under this system is effected as follows, and it is supposed that subscriber A* on his system No. 4 is desirous of communicating with subscriber B5 on system No. 5. It is further premised that A* has the numeral 6 as his individual-call number, and B5 has the numeral 8. The in- IOO dividual-call apparatus in the offices of A4 and B5 are designated as A and A5, respectively, and shown in Figs. 1 and 2, while the construction ofthe individual-alarm instruments, as shown at A and A5 in Figs. 7 and 8, are

also located in the respective offices of A4 and B5. I will now refer to Figs. 14 and 15, and suppose the indicator call hands b b', die., are all at Zero, and likewise subscribers individual-alarm handsV V', 85e., are also at zero' pointer s is on circuit No. 5. It will be seen that two wires (marked 20 and 50) are permanently attached upon the movable switch-board K of A4 to their circuit-breakers tu, and thus the current along any bell-call wire, No. 15 15,1850., may be interrupted or shunted through the individual-alarm apparatus `A' of subscriber A4 at his pleasure. By the lifting of the-lever N to its upper or raised position, as shown in Fig. 14, the current through No. 15 is not interrupted, but continues through post 21, 22, lever N, circuit-closer 43, by wire 31 to post 30, and thence along to the next subscriber; Subscriber A5 now moves his switch board K until the pointer s is in alignment with wire No. 25, when he knows by the position of the circuit-breakerst t t u u u that the currents along the wires on system No. 5 are all directed through'his apparatus. Current along wire No. 15 is now interrupted, if the lever N is in a raised position, since it follows wire 20, post 21, by wire to post 22, lever N, closer 43, wire 44, bell U to closer 45, insulated piece S, Closer 46, Wire 47 to plug e on receiver O, where it is stopped. On the other hand, in case thelever N is in its lowered or depressed position the circuit is continuous, and the current iiows through wire No. 15 to wire 20, post 21 to post 22, lever N, closer 23, by wire 50, thence along wire No. 15 to ne'Xt subscriber. This special purpose of raising the lever N and breaking the current through wire No. 15,

`or any similar wire in any system, is to cut out the indicator switch-hand J, for unless this precaution were taken in ringing` up subscriber B5 or No. 8 every subscribers alarminstrument A5, Src., would click as his individual-switch hand J passed over its switchpin p, and a continual and unnecessary annoyance be created. The other currents on system No. 5 continue as follows: From No. 25,(see Fig. 14) through circuit-breaker t to wire 19, to call-tapper M. and when the latter is actually operated, to wire 18, electro-magnet F, and wire 17 to circuit-breaker u, out upon the continuation of wire No. 25; upon wire No. 35, by wire 16 to tapper L, wire 15,

electro-magnet G, wire 14, to wire No. 35 con-5V tinued. Subscriber A5 now operates the calltapper M, closing the circuit eight times, the number corresponding to the individual-call number 8 of subscriber B5, and the apparatus shown in Figs. 1 and 2, (marked A,) and located with subscriber A4, is operated by theactivity of the electro-,magnet F to advance, as previously described, the indicator-hand b, and similarly and synchronously'therewith by means of the apparatus A5, corresponding to that shown in Figs. ,7 and 8, and located with B5 and similar apparatus in other subscribers Offices, the vindividual-alarm 'indicator-hands V V', &c. VWhen Ail sees his call-indicator hand b in instrument A upon the numeral 8, v as shown in Fig. 14, he stops and now knows that the hand V' on instrument A5 in B5 office is likewise upon a similar numeral 8, (see Fig. 15,) and that the switch-hand J5 in instrument A5 is now upon the shunt-pin p' and. in readiness to ring bell U' of B5 the moment A5 closes the circuit along bell call-wire No. 15. Subscriber A5 accomplishes this by depressing the lever N, when the current along wire N o. 15, heretofore interrupted, passes along wire 20, post 21to post 22, lever N, closer 23, wire 50, along wire No. 15 to subscribers office B5, where it enters post 32 to post33,

closer 34, wire 35 to spring-closer V, (see Figs. 7, 8, and 15,) to shaft C', along switch-hand J5, pin p', wire 71 to bell U', which is rung, and wire 36, thence to closer 37, wire 33, closer 39, insulated block S', closer 40, wire 41 to post 42, and onward along No. 15. Subscriber A* has now called the attention of B5, who knows some other subscriber desires to communicate with him, and after A5 has rung the bell of B5 he'again raises the lever N to switch onhis bell U, and at the same time inserts the plug v upon the receiver O in the post 4S on line No. 15. Similarly B5 inserts the plug 'v' on his receiverO' in the post 54 on line No.' 15 in his office. This completes the circuit on line No. 15 between A4 and B5, and the lever N being in a raised position, the current passes through instrument A' in Al office by wire 20, post 21 to post 22, lever N, closer 43, wire 44, through the bell U to closer 45, insulated block S, closer 46, wire 47, plug fv of receiver O, which is now in cup 48. Thus bell U with'A4 is rung and the latter subscriber is notified that his call has been answered by the party whom he has called, in the present instance B5. A4 receiving answering call from B5 inserts the plug 49 of his receiver 'in the post y on the telephoneline No. 5. Similarly B5 inserts the plug 55 of his instrument A5 iu the cup y' on the same telephonewire, and the two subscribers are then in communication. Providing the line No. 5 is occupied, A4 can shift upon some other wire in order to communicate with B5 in the manner more fully shown and detailed in Letters Patent No. 308,165, issued to myself on the 18th day of November, 1884.

The operation of restoring the individualcall hand` b, which now stands on the dial D, over the numeral 8, upon the apparatus A in the office of A5, as well as the individual-alarm hands V', 82e., which also stand on the numeral 8 upon the dials D5 in all the instruments similar to A5 upon that special circuit No. l5, is as ISO follows: A, having communicated with Bi, presses the tapper L, and by means of the current passing through the wire No. 3i", wire 16 by 15 to electro-magnet G, excites the latter, the current continues by wire 14 and circuitbreaker a to the wire No. 35, and along to subscriber B5 and others. Upon reaching the oice of B5 it enters instrument A3 by post to wire 67 and electro-niagnet G3 and wire 68 onward along the line No. 35. This activity of the magnet G in instrument A (see Figs. 1, 2, 3, and 4) has actuated the lever m, thrusting it against the pin a, and has advanced the rod d forward, bringing the slot k in alignment with the spur wheel E, now locked, and releases it, the latter turning back to its normal position, induced by the coiled spring 5, while further rotatory movement is prevented by engagement of the stop-pins 7 and 8. Similar movement of a lever, not shown, (corresponding to m in instrument A) upon the i'iistrument A3, actuated by the magnet G3, advances the rod d, and the spur-wheel, locked thereby, is free to return toits normal position. Thus it will be seen that each subscriber may actuate his own individual-call instrument A and all the alarm-call instruments corresponding to AA3, &c., upon any system; but he cannot operate his own unless he is calling an individual on his own system or circuit. On the other hand, the operation by a given subscriber of his individual-call hand, b, upon his own instrument A will not operate or eiiect the movement of any other corresponding hand, b', upon an apparatus, A2, in some other office. Thus, if one subscriber, B5, wishes to call some other, he presses his key M the number of times corresponding to that of the individual desired, and thus actuates his own individualcall hand b', and synchronously therewith the alarm-hands V on the instruments correponding to Al A, &c. As regards the position of the switch-board K', the latter is shown with the pointer s between two wires on system No. 6; hence all the systems are direct through B5 office, and it is evident that the position of said board is immaterial when B is called, since No. 5 system on which B5 is located is connected directly to and runs through the individual-alarm apparatus A3 belonging tothe latter. Now, if B5 desires to call a certain individual, the position of his switchboard is material until the pointer s stands upon wire No. 2 of that system, and he then can operate his individual-callapparatus A2 by means of the call-tapper M and electroinagnet F4, and synchronously therewith the alarm apparatus of the individual to be called. Then the same cooperation of similar parts corresponding to those employed by A4 in ringing up B5 is now effected, and communication between B5 and said called subscriber is established.

In active use the operation of the several parts forming this system is very easily and expeditiously effected, and with but small loss of time upon the part of both the called and the calling subscriber.

As before briefly alluded to on the preceding page as regards the operation ofthe individualalarm apparatus-say A3, located in Bf officeit will necessarily follow that if subscriber B5 desires to call any person on his own system No. 5, the circuits upon the wires Nos. 2 35 are closed. and the operation of the tapper M through the electro-magnets F* and F3, will operate the mechanism in instrument Ai equally well with that in A2; hence it will b e observed that each subscriber will operate his own individual-alarm call apparatus A A5, Sac., only when he is operating upon his own circuit or system, otherwise he cannot operate it. Similarly the movement of the key L will actively induce the magnets Gr4 and G, Snc., to release the spur-wheels, whereby the dial or indicator hands b b', &c., V V', &c. can be restored to their normal or zero positions.

I claim i 1. The combination of a dial, an indicatorhand, a spur-wheel turning with said hand, longitudinally-movable rods for actuating and locking said wheel, and an electro-magnet tor operating said rods, all constituting an individual-call indicator, with electrical connections making circuit directly between the several subscribers stations without the intervention of a central station, and apparatus at each subscribers station simultaneously operated by the movement of said indicatorhand, and attached devices to give correspendingindications,substantially as set forth.

2. The combination, of anindicator finger and a spur-wheel with which it turns, with a longitudinallymovable actuating-rod for turning said wheel, a second longitudinally-niovable rod for locking said wheel, an electro-inagnet and springs for actuating said rods, and a series of apparatus electrically connected upon any given circuit, which are similarly and synchronously actuated by the movement of said nger in order that any subscriber may be called by any other on a different circuit, substantially as herein set forth.

3. In an individual-call-indicator apparatus, the combination, with the shaft C, hand b, and spur-wheel E, mount-ed thereupon, of the rod c and pivoted arm c, operating laterally to eligage and advance the wheel by the action ol the lever t' and electro-magnet F, substantially as herein described.

4. The combination, with the locked spurwheel E and actuating-rod c, pivoted arm e, and spiirg, of the rod d and its spur 7L, adapted to engage with each other upon the advance movement of the rod c, induced by an electromagnet, whereby the two rods advance simultaneously to release and advance the wheel E, substantially as and for purposes herein described.

5. The combination, with the spur-wheel E and its spring 5, shaft C, and 'indicator-hand IOO IOS

IIO

b, of the reciprocating lockingrod d, spur h, lever m, and electro-magnet G, whereby activity of the magnet actuates the lever to release and reverse the wheel by means of the spring 5 in order to restore the hand to normalor zero position, substantially as set forth. 6. In a telephonie system, the combination, with a movable switch-board and calltapper or key operating the individual-callindicator apparatus and located in one subscribers office, of a series of UdiViduaLalarm-indicator apparatus electrically connected and operated similarly and synchronously upon any given circuit, by which any subscriber desired may be rung up, substantially as herein described. v v

7. In combination with electric conductors making a series of circuits and a movable switch-board through which they pass, an individual-call-indicator apparatus, a series of individualalarm-indicator instru-ments atmagnet for actuating said rod, the two co'operating substantially as herein set forth, whereby the subscribers attention may be attracted.

9. In an indicator-alarm apparatus, the combination, with the fixed dial D, rotary hand V, and the spur-wheel E', affixed to the shaft C', which is operated by an electro-magnet upon a lever, i', and rod c', engaging with the spur-wheel, of the fixed insulated switch-plate I and the switch-hand J, traveling thereon,

alarm apparatus A, as herein described', the

switch-lever N, provided with the .insulated offset piece S and the contact-plates 23 27 28 43 45 46, arranged as stated, whereby movement of the lever effects change in two distinct circuits, substantially as and forv purposes set forth.

11. rllhe combination, with the individualalarm apparatus A and its pivoted switchlever N, provided with the insulated offset S, ofthe series of circuit-closers 43 23, co-operating with the lever N proper, and the closers 45 46 27 28, which co-operate with the offset S, substantially as and for purposes herein described.

12. The combination,with theseries of wires forming a series of systems, ofthe spring-plates and the movable switch-board K, having the circuit-breakers 't tt a u u, whereby the cur rents from any system may be directed th rough the instruments A A of any calling subscriber, and operating substantially as herein set forth.

13. The combination of an electro-magnet and its armature with the rotary toot-hed Wheel E, the yielding actuatingrod c, which is connected to the aforesaid armature, the locking-bar d, the shaft on which said wheel is mounted, the electrical conductors making circuit through the helix of said magnet, a secondmagnet,conductors makingcircuit through the helix thereof, and an armature actuated by said second magnetaud operating with relation to rod d, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES ALMON JACKSON. Y

Witnesses:

H. E. LoDc n, A. F. HAYDEN.' 

